Normal motorcycle owners do not require a service / workshop manual, to carry out routine servicing.
Because the owner's manual and this website are all you need.
But for more advanced mechanics you can purchase the.
Haynes Honda CBF125 Service Manual
Haynes Honda CBR125 Service Manual
Haynes Yamaha YBR125 Service Manual

Honda and Yamaha also make Workshop Manuals for the bikes.
They cover every single part of the bike but they are written for professional mechanics, not amateur mechanics.

I have not put a forum on this website since 125cc forums never seem to work.

The Honda CBF125 is called the Honda Stunner in India.
There are 2 versions of the bike, the only difference I believe is one has Fuel Injection (PGM-FI) the other has a carburettor.